Made this into an XS module, and it's up on CPAN as Algorithm::LUHN_XS. Hopefully I didn't miss any of you in the CREDITS section. It's using one of the slower C implementations because of some unique requirements like handling non-numeric data, but still significantly faster than the original.

Thanks again all.

In reply to Up on CPAN by kschwab
in thread Faster Luhn Check Digit Calculation? by kschwab

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